Optical recording method having two degrees of reflectivity and a diffraction grating or hologram formed integrally thereon and process for making it
First Claim
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1. An optical recording medium comprising:
- a substrate; and
an information recording pattern formed on the substrate, said information recording pattern including a portion of high reflectivity and a portion of low reflectivity, the portion of low reflectivity of the information recording pattern having a diffraction grating or hologram superimposed thereon.
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Abstract
An optical recording medium of the present invention has on a substrate information recording patterns (2) and (3) distinguishable by a difference in light reflectivity, and is characterized in that said information recording pattern (2) is comprised of a portion (2a) of high reflectivity and a portion (2b) of low reflectivity and at least a part of said information recording patterns is formed by a diffraction grating or hologram (3). Since such plural types of information can be formed at the same time and at high density, the present invention has a merit of its having excellent fake-proofness and its manufacturing process being simplified.
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Citations
14 Claims
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1. An optical recording medium comprising:
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a substrate; and an information recording pattern formed on the substrate, said information recording pattern including a portion of high reflectivity and a portion of low reflectivity, the portion of low reflectivity of the information recording pattern having a diffraction grating or hologram superimposed thereon. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An optical recording medium comprising:
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a substrate; and means for displaying information on said substrate, said means for displaying information including a first information pattern encoded in either an area of first reflectivity or an area of second reflectivity, and a second information pattern encoded in a diffraction grating or hologram formed integrally with said substrate and superimpsoed on said area of first reflectivity.
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14. An optical recording medium comprising:
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a substrate, said substrate having an information recording area having a first portion of first reflectivity and a second portion of second reflectivity; and means for inhibiting counterfeiting, said means including a diffraction grating or hologram formed integrally with said substrate and superimposed on said first portion of first reflectivity or said second portion of second reflectivity.
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Specification